74VHCT240AMTR

Buffers, Drivers, Receivers, Transceivers Overview

The 74VHCT240AMTR is an advanced high-speed CMOS octal bus buffer with inverted 3-state outputs, fabricated using sub-micron silicon gate and double-layer metal wiring C2MOS technology. It operates within a supply voltage range of 4.5V to 5.5V. The device features two independent groups of four buffers controlled by separate enable inputs (G and 2G). It provides power-down protection on all inputs and outputs, allowing 0V to 7V input acceptance regardless of the supply voltage. The component ensures symmetrical output impedance with minimum drive currents of 8mA for both high and low states.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Octal bus buffer configuration with inverted 3-state outputs
• TTL-compatible input thresholds enabling 5V to 3V interfacing
• Power-down protection on inputs and outputs
• Symmetrical output impedance with balanced propagation delays

Buffers, Drivers, Receivers, Transceivers Applications

• 3-state memory address drivers
• Bus-oriented communications systems
• Clock distribution circuits
• Data acquisition control systems

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the obsolete status of this specific part number before initiating procurement actions. Confirm that the SOP-20 package variant matches the AMTR suffix designation in current distributor catalogs. Ensure design-in approval accounts for the discontinuation timeline and potential long-term supply constraints associated with legacy logic families.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when TTL-level compatibility is required alongside CMOS low-power characteristics. The VHCT series bridges 5V CMOS logic with standard TTL input levels. Consider the dual-group architecture for managing separate data buses. Verify that the operating temperature range of -55°C to 125°C meets environmental requirements for the target application.

Buffers, Drivers, Receivers, Transceivers Part Context

This device belongs to the 74VHCT family of advanced high-speed CMOS logic ICs manufactured by STMicroelectronics. It serves as a direct pin-and-function compatible replacement for older 74LS240 or 74HC240 equivalents while offering improved latch-up immunity and lower noise characteristics. The AMTR suffix specifically denotes the tape and reel packaging format for the SOP-20 surface-mount package.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

Direct substitutes include the 74VHCT240ATTR (TSSOP-20 package) from the same manufacturer. Cross-manufacturer equivalents such as the MC74VHCT240ADTR2G from onsemi offer functional parity. Verify package dimensions and lead configurations when transitioning between SOP and TSSOP footprints.